bin/setfacl/merge.c

   1 /*-
   2  * Copyright (c) 2001 Chris D. Faulhaber
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD$");
  29
  30 #include <sys/types.h>
  31 #include <sys/acl.h>
  32 #include <sys/stat.h>
  33
  34 #include <err.h>
  35 #include <stdio.h>
  36
  37 #include "setfacl.h"
  38
  39 static int merge_user_group(acl_entry_t *entry, acl_entry_t *entry_new,
  40     int acl_brand);
  41
  42 static int
  43 merge_user_group(acl_entry_t *entry, acl_entry_t *entry_new, int acl_brand)
  44 {
  45         acl_permset_t permset;
  46         acl_entry_type_t entry_type;
  47         acl_flagset_t flagset;
  48         int have_entry;
  49         uid_t *id, *id_new;
  50
  51         have_entry = 0;
  52
  53         id = acl_get_qualifier(*entry);
  54         if (id == NULL)
  55                 err(1, "acl_get_qualifier() failed");
  56         id_new = acl_get_qualifier(*entry_new);
  57         if (id_new == NULL)
  58                 err(1, "acl_get_qualifier() failed");
  59         if (*id == *id_new) {
  60                 /* any other matches */
  61                 if (acl_get_permset(*entry, &permset) == -1)
  62                         err(1, "acl_get_permset() failed");
  63                 if (acl_set_permset(*entry_new, permset) == -1)
  64                         err(1, "acl_set_permset() failed");
  65
  66                 if (acl_brand == ACL_BRAND_NFS4) {
  67                         if (acl_get_entry_type_np(*entry, &entry_type))
  68                                 err(1, "acl_get_entry_type_np() failed");
  69                         if (acl_set_entry_type_np(*entry_new, entry_type))
  70                                 err(1, "acl_set_entry_type_np() failed");
  71                         if (acl_get_flagset_np(*entry, &flagset))
  72                                 err(1, "acl_get_flagset_np() failed");
  73                         if (acl_set_flagset_np(*entry_new, flagset))
  74                                 err(1, "acl_set_flagset_np() failed");
  75                 }
  76
  77                 have_entry = 1;
  78         }
  79         acl_free(id);
  80         acl_free(id_new);
  81
  82         return (have_entry);
  83 }
  84
  85 /*
  86  * merge an ACL into existing file's ACL
  87  */
  88 int
  89 merge_acl(acl_t acl, acl_t *prev_acl, const char *filename)
  90 {
  91         acl_entry_t entry, entry_new;
  92         acl_permset_t permset;
  93         acl_t acl_new;
  94         acl_tag_t tag, tag_new;
  95         acl_entry_type_t entry_type, entry_type_new;
  96         acl_flagset_t flagset;
  97         int entry_id, entry_id_new, have_entry, had_entry, entry_number = 0;
  98         int acl_brand, prev_acl_brand;
  99
 100         acl_get_brand_np(acl, &acl_brand);
 101         acl_get_brand_np(*prev_acl, &prev_acl_brand);
 102
 103         if (branding_mismatch(acl_brand, prev_acl_brand)) {
 104                 warnx("%s: branding mismatch; existing ACL is %s, "
 105                     "entry to be merged is %s", filename,
 106                     brand_name(prev_acl_brand), brand_name(acl_brand));
 107                 return (-1);
 108         }
 109
 110         acl_new = acl_dup(*prev_acl);
 111         if (acl_new == NULL)
 112                 err(1, "%s: acl_dup() failed", filename);
 113
 114         entry_id = ACL_FIRST_ENTRY;
 115
 116         while (acl_get_entry(acl, entry_id, &entry) == 1) {
 117                 entry_id = ACL_NEXT_ENTRY;
 118                 have_entry = 0;
 119                 had_entry = 0;
 120
 121                 /* keep track of existing ACL_MASK entries */
 122                 if (acl_get_tag_type(entry, &tag) == -1)
 123                         err(1, "%s: acl_get_tag_type() failed - "
 124                             "invalid ACL entry", filename);
 125                 if (tag == ACL_MASK)
 126                         have_mask = 1;
 127
 128                 /* check against the existing ACL entries */
 129                 entry_id_new = ACL_FIRST_ENTRY;
 130                 while (acl_get_entry(acl_new, entry_id_new, &entry_new) == 1) {
 131                         entry_id_new = ACL_NEXT_ENTRY;
 132
 133                         if (acl_get_tag_type(entry, &tag) == -1)
 134                                 err(1, "%s: acl_get_tag_type() failed",
 135                                     filename);
 136                         if (acl_get_tag_type(entry_new, &tag_new) == -1)
 137                                 err(1, "%s: acl_get_tag_type() failed",
 138                                     filename);
 139                         if (tag != tag_new)
 140                                 continue;
 141
 142                         /*
 143                          * For NFSv4, in addition to "tag" and "id" we also
 144                          * compare "entry_type".
 145                          */
 146                         if (acl_brand == ACL_BRAND_NFS4) {
 147                                 if (acl_get_entry_type_np(entry, &entry_type))
 148                                         err(1, "%s: acl_get_entry_type_np() "
 149                                             "failed", filename);
 150                                 if (acl_get_entry_type_np(entry_new, &entry_type_new))
 151                                         err(1, "%s: acl_get_entry_type_np() "
 152                                             "failed", filename);
 153                                 if (entry_type != entry_type_new)
 154                                         continue;
 155                         }
 156
 157                         switch(tag) {
 158                         case ACL_USER:
 159                         case ACL_GROUP:
 160                                 have_entry = merge_user_group(&entry,
 161                                     &entry_new, acl_brand);
 162                                 if (have_entry == 0)
 163                                         break;
 164                                 /* FALLTHROUGH */
 165                         case ACL_USER_OBJ:
 166                         case ACL_GROUP_OBJ:
 167                         case ACL_OTHER:
 168                         case ACL_MASK:
 169                         case ACL_EVERYONE:
 170                                 if (acl_get_permset(entry, &permset) == -1)
 171                                         err(1, "%s: acl_get_permset() failed",
 172                                             filename);
 173                                 if (acl_set_permset(entry_new, permset) == -1)
 174                                         err(1, "%s: acl_set_permset() failed",
 175                                             filename);
 176
 177                                 if (acl_brand == ACL_BRAND_NFS4) {
 178                                         if (acl_get_entry_type_np(entry, &entry_type))
 179                                                 err(1, "%s: acl_get_entry_type_np() failed",
 180                                                     filename);
 181                                         if (acl_set_entry_type_np(entry_new, entry_type))
 182                                                 err(1, "%s: acl_set_entry_type_np() failed",
 183                                                     filename);
 184                                         if (acl_get_flagset_np(entry, &flagset))
 185                                                 err(1, "%s: acl_get_flagset_np() failed",
 186                                                     filename);
 187                                         if (acl_set_flagset_np(entry_new, flagset))
 188                                                 err(1, "%s: acl_set_flagset_np() failed",
 189                                                     filename);
 190                                 }
 191                                 had_entry = have_entry = 1;
 192                                 break;
 193                         default:
 194                                 /* should never be here */
 195                                 errx(1, "%s: invalid tag type: %i", filename, tag);
 196                                 break;
 197                         }
 198                 }
 199
 200                 /* if this entry has not been found, it must be new */
 201                 if (had_entry == 0) {
 202
 203                         /*
 204                          * NFSv4 ACL entries must be prepended to the ACL.
 205                          * Appending them at the end makes no sense, since
 206                          * in most cases they wouldn't even get evaluated.
 207                          */
 208                         if (acl_brand == ACL_BRAND_NFS4) {
 209                                 if (acl_create_entry_np(&acl_new, &entry_new, entry_number) == -1) {
 210                                         warn("%s: acl_create_entry_np() failed", filename);
 211                                         acl_free(acl_new);
 212                                         return (-1);
 213                                 }
 214                                 /*
 215                                  * Without this increment, adding several
 216                                  * entries at once, for example
 217                                  * "setfacl -m user:1:r:allow,user:2:r:allow",
 218                                  * would make them appear in reverse order.
 219                                  */
 220                                 entry_number++;
 221                         } else {
 222                                 if (acl_create_entry(&acl_new, &entry_new) == -1) {
 223                                         warn("%s: acl_create_entry() failed", filename);
 224                                         acl_free(acl_new);
 225                                         return (-1);
 226                                 }
 227                         }
 228                         if (acl_copy_entry(entry_new, entry) == -1)
 229                                 err(1, "%s: acl_copy_entry() failed", filename);
 230                 }
 231         }
 232
 233         acl_free(*prev_acl);
 234         *prev_acl = acl_new;
 235
 236         return (0);
 237 }
 238
 239 int
 240 add_acl(acl_t acl, uint entry_number, acl_t *prev_acl, const char *filename)
 241 {
 242         acl_entry_t entry, entry_new;
 243         acl_t acl_new;
 244         int entry_id, acl_brand, prev_acl_brand;
 245
 246         acl_get_brand_np(acl, &acl_brand);
 247         acl_get_brand_np(*prev_acl, &prev_acl_brand);
 248
 249         if (prev_acl_brand != ACL_BRAND_NFS4) {
 250                 warnx("%s: the '-a' option is only applicable to NFSv4 ACLs",
 251                     filename);
 252                 return (-1);
 253         }
 254
 255         if (branding_mismatch(acl_brand, ACL_BRAND_NFS4)) {
 256                 warnx("%s: branding mismatch; existing ACL is NFSv4, "
 257                     "entry to be added is %s", filename,
 258                     brand_name(acl_brand));
 259                 return (-1);
 260         }
 261
 262         acl_new = acl_dup(*prev_acl);
 263         if (acl_new == NULL)
 264                 err(1, "%s: acl_dup() failed", filename);
 265
 266         entry_id = ACL_FIRST_ENTRY;
 267
 268         while (acl_get_entry(acl, entry_id, &entry) == 1) {
 269                 entry_id = ACL_NEXT_ENTRY;
 270
 271                 if (acl_create_entry_np(&acl_new, &entry_new, entry_number) == -1) {
 272                         warn("%s: acl_create_entry_np() failed", filename);
 273                         acl_free(acl_new);
 274                         return (-1);
 275                 }
 276
 277                 /*
 278                  * Without this increment, adding several
 279                  * entries at once, for example
 280                  * "setfacl -m user:1:r:allow,user:2:r:allow",
 281                  * would make them appear in reverse order.
 282                  */
 283                 entry_number++;
 284
 285                 if (acl_copy_entry(entry_new, entry) == -1)
 286                         err(1, "%s: acl_copy_entry() failed", filename);
 287         }
 288
 289         acl_free(*prev_acl);
 290         *prev_acl = acl_new;
 291
 292         return (0);
 293 }